To find the common factors between two numbers, first list out all of their factors and then choose the ones that they have in common.
For example: If your numbers were 36 and 28, you would list out the factors for each:
36| 1, 2, 3, 4, 6, 9, 12, 36
28| 1, 2, 4, 7, 14, 28
The common factors are: 1, 2, & 4
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Factor both numbers. Select the factors they both have in common. Choose the largest (greatest) one.
There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
You need at least two numbers to find something in common.